以硅酸钠为无机改性剂,硬脂酸为有机改性剂对无水硫酸钙晶须进行双重表面改性.通过接触角测试(WCA)、X射线衍射(XRD)、场发射扫描电镜(FESEM)、傅里叶红外光谱(FT-IR)和X射线光电子能谱(XPS)等多种分析手段对样品进行表征分析.实验结果表明:无机-有机改性后晶须表面性质由亲水性转变为疏水性,晶体结构未发生改变.在双重改性过程中,晶须表面首先生成-Ca-SiO3结构,-Ca-SiO3结构部分水解后,晶须表面与硬脂酸发生键合反应,生成-Ca-HSiO3和-Ca-COOR结构包覆层,晶须表面不存在物理吸附作用.
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